<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
	</body>

	<script type="text/javascript">
		
		alert(   'hello  JavaScript') //  弹出一个警告框
		// alert('halo') ;//弹出第二个警告框
	</script>
</html>
